# -*- coding: utf-8 -*-
"""
Util functions for the NXOS API modules.
"""
from __future__ import absolute_import, print_function, unicode_literals

# Import Python std lib
import json
import logging

# Import salt libs
import salt.utils.http
from salt.exceptions import SaltException
from salt.ext import six
from salt.utils.args import clean_kwargs

log = logging.getLogger(__name__)

RPC_INIT_KWARGS = [
    "transport",
    "host",
    "username",
    "password",
    "port",
    "timeout",
    "verify",
    "rpc_version",
]


def _prepare_connection(**nxos_api_kwargs):
    """
    Prepare the connection with the remote network device, and clean up the key
    value pairs, removing the args used for the connection init.
    """
    nxos_api_kwargs = clean_kwargs(**nxos_api_kwargs)
    init_kwargs = {}
    # Clean up any arguments that are not required
    for karg, warg in six.iteritems(nxos_api_kwargs):
        if karg in RPC_INIT_KWARGS:
            init_kwargs[karg] = warg
    if "host" not in init_kwargs:
        init_kwargs["host"] = "localhost"
    if "transport" not in init_kwargs:
        init_kwargs["transport"] = "https"
    if "port" not in init_kwargs:
        init_kwargs["port"] = 80 if init_kwargs["transport"] == "http" else 443
    verify = init_kwargs.get("verify", True)
    if isinstance(verify, bool):
        init_kwargs["verify_ssl"] = verify
    else:
        init_kwargs["ca_bundle"] = verify
    if "rpc_version" not in init_kwargs:
        init_kwargs["rpc_version"] = "2.0"
    if "timeout" not in init_kwargs:
        init_kwargs["timeout"] = 60
    return init_kwargs


def rpc(commands, method="cli", **kwargs):
    """
    Execute an arbitrary RPC request via the Nexus API.

    commands
        The commands to be executed.

    method: ``cli``
        The type of the response, i.e., raw text (``cli_ascii``) or structured
        document (``cli``). Defaults to ``cli`` (structured data).

    transport: ``https``
        Specifies the type of connection transport to use. Valid values for the
        connection are ``http``, and  ``https``.

    host: ``localhost``
        The IP address or DNS host name of the connection device.

    username: ``admin``
        The username to pass to the device to authenticate the NX-API connection.

    password
        The password to pass to the device to authenticate the NX-API connection.

    port
        The TCP port of the endpoint for the NX-API connection. If this keyword is
        not specified, the default value is automatically determined by the
        transport type (``80`` for ``http``, or ``443`` for ``https``).

    timeout: ``60``
        Time in seconds to wait for the device to respond. Default: 60 seconds.

    verify: ``True``
        Either a boolean, in which case it controls whether we verify the NX-API
        TLS certificate, or a string, in which case it must be a path to a CA bundle
        to use. Defaults to ``True``.
    """
    init_args = _prepare_connection(**kwargs)
    log.error("These are the init args:")
    log.error(init_args)
    url = "{transport}://{host}:{port}/ins".format(
        transport=init_args["transport"], host=init_args["host"], port=init_args["port"]
    )
    headers = {"content-type": "application/json-rpc"}
    payload = []
    if not isinstance(commands, (list, tuple)):
        commands = [commands]
    for index, command in enumerate(commands):
        payload.append(
            {
                "jsonrpc": init_args["rpc_version"],
                "method": method,
                "params": {"cmd": command, "version": 1},
                "id": index + 1,
            }
        )
    opts = {"http_request_timeout": init_args["timeout"]}
    response = salt.utils.http.query(
        url,
        method="POST",
        opts=opts,
        data=json.dumps(payload),
        header_dict=headers,
        decode=True,
        decode_type="json",
        **init_args
    )
    if "error" in response:
        raise SaltException(response["error"])
    response_list = response["dict"]
    if isinstance(response_list, dict):
        response_list = [response_list]
    for index, command in enumerate(commands):
        response_list[index]["command"] = command
    return response_list
